There are two things, maybe three actually that suck about the Sony MDR7506's.

First of all, every one of them are louder on the right side than the left. It is amazin to me that people find these acceptable. It is a big difference to a person with good hearing.

Second, the bass is hyped.

Third, they blow-up easily. Sony heard these complaints and did not change a thing on the 7506. But they did make a step up, and that is what I would consider. The balance is fixed, they take 2W's of power, and the f response is closer to linear. Check out the MDR7509.